stdio-common/_i18n_number.h

   1 /* Copyright (C) 2000, 2004, 2008 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@gnu.org>, 2000.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <wchar.h>
  21 #include <wctype.h>
  22
  23 #include "../locale/outdigits.h"
  24 #include "../locale/outdigitswc.h"
  25
  26 static CHAR_T *
  27 _i18n_number_rewrite (CHAR_T *w, CHAR_T *rear_ptr, CHAR_T *end)
  28 {
  29 #ifdef COMPILE_WPRINTF
  30 # define decimal NULL
  31 # define thousands NULL
  32 #else
  33   char decimal[MB_LEN_MAX];
  34   char thousands[MB_LEN_MAX];
  35 #endif
  36
  37   /* "to_outpunct" is a map from ASCII decimal point and thousands-sep
  38      to their equivalent in locale. This is defined for locales which
  39      use extra decimal point and thousands-sep.  */
  40   wctrans_t map = __wctrans ("to_outpunct");
  41   wint_t wdecimal = __towctrans (L'.', map);
  42   wint_t wthousands = __towctrans (L',', map);
  43
  44 #ifndef COMPILE_WPRINTF
  45   if (__builtin_expect (map != NULL, 0))
  46     {
  47       mbstate_t state;
  48       memset (&state, '\0', sizeof (state));
  49
  50       if (__wcrtomb (decimal, wdecimal, &state) == (size_t) -1)
  51         memcpy (decimal, ".", 2);
  52
  53       memset (&state, '\0', sizeof (state));
  54
  55       if (__wcrtomb (thousands, wthousands, &state) == (size_t) -1)
  56         memcpy (thousands, ",", 2);
  57     }
  58 #endif
  59
  60   /* Copy existing string so that nothing gets overwritten.  */
  61   CHAR_T *src;
  62   bool use_alloca = __libc_use_alloca ((rear_ptr - w) * sizeof (CHAR_T));
  63   if (__builtin_expect (use_alloca, true))
  64     src = (CHAR_T *) alloca ((rear_ptr - w) * sizeof (CHAR_T));
  65   else
  66     {
  67       src = (CHAR_T *) malloc ((rear_ptr - w) * sizeof (CHAR_T));
  68       if (src == NULL)
  69         /* If we cannot allocate the memory don't rewrite the string.
  70            It is better than nothing.  */
  71         return w;
  72     }
  73
  74   CHAR_T *s = (CHAR_T *) __mempcpy (src, w,
  75                                     (rear_ptr - w) * sizeof (CHAR_T));
  76
  77   w = end;
  78
  79   /* Process all characters in the string.  */
  80   while (--s >= src)
  81     {
  82       if (*s >= '0' && *s <= '9')
  83         {
  84           if (sizeof (CHAR_T) == 1)
  85             w = (CHAR_T *) outdigit_value ((char *) w, *s - '0');
  86           else
  87             *--w = (CHAR_T) outdigitwc_value (*s - '0');
  88         }
  89       else if (__builtin_expect (map == NULL, 1) || (*s != '.' && *s != ','))
  90         *--w = *s;
  91       else
  92         {
  93           if (sizeof (CHAR_T) == 1)
  94             {
  95               const char *outpunct = *s == '.' ? decimal : thousands;
  96               size_t dlen = strlen (outpunct);
  97
  98               w -= dlen;
  99               while (dlen-- > 0)
 100                 w[dlen] = outpunct[dlen];
 101             }
 102           else
 103             *--w = *s == '.' ? (CHAR_T) wdecimal : (CHAR_T) wthousands;
 104         }
 105     }
 106
 107   if (! use_alloca)
 108     free (src);
 109
 110   return w;
 111 }